Johnson, who came through Arsenal’s academy, was effusive in his praise of Crowley and rubbished reports that he had failed to make the grade at the third-tier club.

Johnson said: ‘I think that Dan’s had a fantastic time here, we’ve really enjoyed working with him. He’s probably one of the best, or the best, or most talented 18-year-olds I’ve ever seen.

‘Obviously I came through the ranks at Arsenal as well, so there’s players like Ashley Cole that I include in that, players that have had very good careers.”

Injuries in midfield have depleted Arsene Wenger’s squad depleted, opening the door to Crowley, who was called by England Under-19s for the first time earlier this month.

Johnson added: “For me, it was fantastic to work with him, really enjoyed it, really appreciative to Arsenal. I think he had four or five really good effective games for us that showed his quality and where he could be.

Young gun: Ashley Cole was tipped to be a star when he emerged from Arsenal’s youth ranks

“He had a couple of injuries, he was called up by England, which stunted the starts he could have had, but I’ve got nothing but positive thoughts about him as a lad and as a player.

“Of course, as a coach I’d love to work with him someday in the future, because I believe at some point this boy will play for the England national team, if he can iron out the little bits that will come through maturing and playing in a different level. I’m disappointed to lose him, but it’s the law.”